Coevolución de interacciones hospedante - patógeno en frijol común

Araya, Carlos Manuel

doi:10.1590/s0100-41582003000300001

Cited by 17 publications

(21 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This demonstrates the great adaptability and survival capacity of this pathogen, an important consideration in breeding P. vulgaris for resistance. The variable genetic composition of the fungus can affect the dynamics of the pathogen-host relationship, as pathogens are able to adapt to specific ecological niches in diverse agrosystems (Araya, 2003).…”

Section: Discussionmentioning

confidence: 99%

Virulence and molecular characterization of Costa Rican isolates of Rhizoctonia solani from common bean

Mora-Umaña¹,

Barboza²,

Alvarado³

et al. 2013

Trop. plant pathol.

View full text Add to dashboard Cite

Web blight is one of the main diseases that affects bean (Phaseolus vulgaris) cultivation. It infects diverse organs at any growth stage of the plant and can be present at different altitudes in a humid tropical climate. The causal agent of this disease is Thanatephorus cucumeris in its sexual stage and Rhizoctonia solani in the anamorph. The objective of this investigation was to characterize molecular isolates of R. solani obtained from bean plants from diverse production regions in Costa Rica and determine their virulence. Fifty-one samples of symptomatic bean plants were collected using a global positioning system. Virulence was evaluated using the detached leaf technique. Isolates were identified using AG 1-IA, AG 1-IB, AG 1-IC, AG 1-ID, AG 2-2, AG 2-2IIIB, AG 2-2IV and AG 4 molecular markers. ITS sequences were obtained and analyzed with BLAST, aligned, and a phylogenetic tree was constructed. A high degree of virulence and genetic variability between isolates was identified and the anastomosis subgroups of isolates were independent of their geographical origin.

show abstract

Section: Discussionmentioning

confidence: 99%

Virulence and molecular characterization of Costa Rican isolates of Rhizoctonia solani from common bean

Mora-Umaña¹,

Barboza²,

Alvarado³

et al. 2013

Trop. plant pathol.

View full text Add to dashboard Cite

show abstract

“…lindemuthianum es conocido mundialmente por presentar una amplia variabilidad patogénica (Kelly et al, 1994;Araya, 2003;Rodríguez-Guerra et al, 2006;Sánchez-García et al, 2009;Campa et al, 2011;Pinto et al, 2012) y los resultados obtenidos en este estudio lo confirmaron al identificar trece razas diferentes de diecisiete aislamientos provenientes de tres provincias de Ecuador.…”

Section: Discussionunclassified

“…Las poblaciones del patógeno de origen andino son más virulentas con las variedades diferenciales del acervo andino, debido a la mayor adaptación de razas a cultivares de la misma región geográfica (coevolución hospedante-patógeno) (Balardin et al, 1997;González et al, 1998;Araya, 2003;Gonçalves-Vidigal et al, 2012). De manera general, esto fue observado en los resultados de este estudio, ya que las variedades diferenciales de origen mesoamericano con sus respectivos genes: Cornell 49242 (Co-2), TU (Co-5), AB 136 (Co-6), G2333 (Co-4 2 , Co-5 2 , Co-7), presentaron resistencia para todos los aislamientos analizados.…”

Section: Discussionunclassified

Variabilidad patogénica de Colletotrichum lindemuthianum y resistencia en germoplasma de Phaseolus vulgaris L. de Ecuador

et al. 2018

View full text Add to dashboard Cite

Anthracnose caused by Colletotrichum lindemuthianum is one of the most economically important diseases of bean (Phaseolus vulgaris L.) cultivation in Ecuador. The best control alternative is the use of resistant varieties. C. lindemuthianum presents great pathogenic variability, which hinders the development of varieties with a lasting resistance, therefore, the knowledge of the presence and distribution of the physiological races of the pathogen and the identification of resistance genes are key to developing varieties with broad and lasting resistance. The objective of this research was to determine the pathogenic variability of C. lindemuthianum and to evaluate the resistance of Ecuadorian bean germplasm. The research was carried out between 2013 and 2014. Seventeen isolates of C. lindemuthianum from northern central Ecuador were characterized by the inoculation of a group of twelve standard differential bean varieties. Among the analyzed samples, thirteen races were identified; five of those races had not been previously reported in the country. The differential G2333 (Co-42, Co-52 and Co-7) presented resistance to every characterized races in Ecuador. In addition, twenty - one improved varieties and elite bean lines were evaluated with sixteen of the seventeen isolates, three genotypes were identified (TB2, TB3 and INIAP 485 Urcuquí) with resistance to the mentioned isolates, which can be used as sources of resistance to Anthracnose. The identified sources of resistance in this study will allow to plan the development of bean varieties with broad and durable resistance to C. lindemuthianum.

show abstract

“…A variabilidade genética é uma condição presente nos patossistemas silvestres preservados e é aumentada nos agroecossistemas. A alteração do padrão dos cultivos, por meio do melhoramento, a ampliação de fronteiras agrícolas, e o uso intensivo de defensivos agrícolas são fatores que aumentam a força da seleção exercida sobre as populações de patógenos, favorecendo a geração de novos genes de virulência e aumento no grau de polimorfismo na estrutura dessas populações (ARAYA, 2003). Possivelmente a maior diversidade genética na população de C. gloeosporiodes resulta do longo período de coexistência dessa espécie às plantas cítricas, e pela elevada pressão de seleção decorrente das profundas modificações do ecossistema citrícola, especialmente do uso intensivo de defensivos empregados na cultura nos últimos anos.…”

Section: A L Da Silveira Et Alunclassified

CARACTERIZAÇÃO MOLECULAR DE ISOLADOS DE Colletotrichum spp. ASSOCIADOS A PODRIDÃO FLORAL DOS CITROS

et al. 2016

View full text Add to dashboard Cite

RESUMO-A podridão floral dos citros (PFC) é uma importante doença dessa cultura, responsável por elevadas perdas de produção. Normalmente, essa doença mostra-se limitante quando ocorrem prolongados períodos chuvosos durante o florescimento das plantas ou quando existe intenso molhamento foliar. Duas espécies de Colletotrichum estão associadas à doença: C. acutatum e C. gloeosporioides. Entretanto, recentemente, tem-se verificado que, mesmo sob condições não tão propícias, a doença tem ocorrido com relativa frequência, suspeitando-se do envolvimento de outras espécies de Colletotrichum ou de novas condições de adaptação das espécies descritas. Este trabalho teve como objetivo determinar se há ou não outra espécie de Colletotrichum associada a PFC e avaliar a viabilidade do emprego de marcadores moleculares ISSR na caracterização taxonômica de isolados de Colletotrichum spp. associados a sintomas de PFC em flores, assim como de tecidos foliares e frutos cítricos assintomáticos. Para tanto, foi empregada uma combinação de iniciadores específicos, levando em conta a região ITS e marcadores moleculares ISSR. Os marcadores ISSR mostraram-se eficientes na caracterização taxonômica dos isolados de Colletotrichum analisados. A população avaliada foi constituída apenas por C. acutatum e C. gloeosporioides, descartando o envolvimento de uma espécie adicional. Foi constatada alta diversidade genética entre os isolados analisados, o que também se mostra convergente quanto às diferenças fenotípicas observadas sob condições de campo. Entretanto, não foi encontrada relação quanto à origem e as espécies de Colletotrichum spp. associadas. De modo inédito, ainda que assintomaticamente, foi detectada a presença de um isolado de C. acutatum associado a frutos cítricos. Termos para indexação: Citrus sinensis, marcadores ISSR, região ITS. MOLECULAR ChARACTERIZATIOn OF Colletotrichum SPP. ISOLATES ASSOCIATED wITh POST-bLOOM FRUIT DROPAbSTRACT -Postbloom fruit drop of citrus (PFD) is a serious disease of this crop, accounting for high yield losses. Usually, this disease shows to be limiting when there are prolonged rainy periods during plant flowering or when there is intense leaf wetness. Two Colletotrichum species are associated with the disease: C. acutatum and C. gloeosporioides. However, recently, it has been found that, even under not so favorable conditions, the disease has occurred with some frequency; one suspects the involvement of other Colletotrichum species or new adaptation conditions of the described species. This study aimed to determine whether there is another Colletotrichum species associated with PFD and the viability of using molecular markers ISSR for taxonomic characterization of Colletotrichum spp. isolates associated with PFD symptoms in flowers, as well as of leaf tissues and asymptomatic citrus fruits. For this purpose, we used a combination of specific primers, taking into account the ITS region and ISSR molecular markers. ISSR markers have proven to be effective for taxonomic characterization of the Colletot...

show abstract

Coevolución de interacciones hospedante - patógeno en frijol común

Cited by 17 publications

References 41 publications

Virulence and molecular characterization of Costa Rican isolates of Rhizoctonia solani from common bean

Virulence and molecular characterization of Costa Rican isolates of Rhizoctonia solani from common bean

Variabilidad patogénica de Colletotrichum lindemuthianum y resistencia en germoplasma de Phaseolus vulgaris L. de Ecuador

CARACTERIZAÇÃO MOLECULAR DE ISOLADOS DE Colletotrichum spp. ASSOCIADOS A PODRIDÃO FLORAL DOS CITROS

Contact Info

Product

Resources

About